US5699740A - Method of loading metal printing plates on a vacuum drum - Google Patents
Method of loading metal printing plates on a vacuum drum Download PDFInfo
- Publication number
- US5699740A US5699740A US08/664,480 US66448096A US5699740A US 5699740 A US5699740 A US 5699740A US 66448096 A US66448096 A US 66448096A US 5699740 A US5699740 A US 5699740A
- Authority
- US
- United States
- Prior art keywords
- printing plate
- cylinder
- plate
- curvature
- loading
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F27/00—Devices for attaching printing elements or formes to supports
- B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
- B41F27/1212—Devices for attaching printing elements or formes to supports for attaching flexible printing formes using pneumatic force
Definitions
- the invention relates to printing, and in particular, to the loading of metal lithographic printing plates onto a drum, or cylinder, where they are held in place by the force of vacuum.
- the invention can be used on Computer-to-Plate or Computer-to-Press systems, also known as On-Press Imaging.
- the plate can be imaged on the drum (as done in Computer-to-Plate and Computer-to-Press), or pre-imaged and mounted later on the plate cylinder of a printing press. In the latter application, using vacuum instead of clamps allows nearly gapless plate mounting and simplified automatic loading of plates.
- the invention can also be used to load onto a press thin metal backed flexographic plates and other metal backed plates.
- the invention relies on the fact that the thin sheets of metal used as a substrate for printing plates can be given a permanent curl to fit the form of the drum. If the plates were to be pre-curled it would cause handling problems, particularly during plate development, as well as the curl will have to be opened up to wrap the plate around the plate cylinder or imaging drum. For soft aluminum plates they will not spring back to fit on the cylinder. On the other hand, if the plate is fed to the drum as a flat sheet and the curl is imparted to the plate as it is wrapping itself on the drum, the plate can be made to fit the drum and stay in place even without vacuum. This curl can be generated by three rollers located next to the plate cylinder. The addition of a fourth roller allows the straightening out of the plate when it is being unloaded.
- the rollers operate in an arrangement similar to sheet metal rolling devices.
- the radius of the curl imparted to the plate can be smaller than the radius of the cylinder, thus the plate will stay securely on the drum even in the event of failure of the vacuum system.
- it is advantageous to increase the friction of the cylinder surface by embedding diamond grit into it.
- the diamond grit forms micro-indentations preventing any plate slippage during printing.
- the invention can be used for any plate based on a metal substrate, even if the active layer in nonmetallic.
- FIG. 1 shows schematically a side view of the invention.
- FIG. 2. shows a side view of an alternative embodiment of the invention.
- Metal printing plate 1 is loaded on cylinder 2 and held in place by the action of vacuum.
- the inside of cylinder 2 is evacuated by vacuum pump 3, connected to the cylinder via a rotary vacuum fitting 4.
- the vacuum reaches the cylinder surface via small holes 5.
- Cylinder 2 can, by way of example, be the imaging drum or cylinder of a Computer-to-Plate system. Once plate 1 is loaded on cylinder 2, cylinder 2 rotates and a laser (not shown) imagewise exposes the plate.
- Such Computer-to-Plate devices are commercially available and need no further details.
- Cylinder 2 can also be the plate cylinder of an offset lithographic sheet fed or web press.
- the friction between the surface of the plate cylinder and the plate is increased by embedding fine diamond powder (particle size from 50 to 100 microns) in the surface of the plate cylinder.
- the diamond powder (or any other hard and sharp particles) can be attached to the plate cylinder surface by rolling over them with a hard roller or by electroplating.
- no means to increase friction are required.
- holes 5 other means can be used to bring and distribute the vacuum across the cylinder surface.
- vacuum distribution means can be grooves, surface texture, porous cylinder wall and others.
- a cluster of four rollers 4, 5, 6 and 7 is located in proximity to cylinder 2. It is sufficient to motorize one of the rollers 6 using motor 8. Motor 8 can be directly or indirectly coupled to roller 6. Since the outside surface of some printing plates can be sensitive to scratches, rollers 6 and 7 are coated with an elastomeric coating such as rubber or polyurethane. Rollers 5 and 6 form a pair of pinch rollers, with a gap comparable to the thickness of the plate. The exact gap is not critical and can exceed the plate thickness. All four rollers extend to the full length of cylinder 2. Roller 7 is located in the way of the plate emerging from rollers 5 and 6 and causes it to bend and curl towards cylinder 2.
- the position of roller 7 can be selected so that the residual curl imparted to plate 1 is about equal to the curvature of the cylinder 2 or the radius of the residual curl is smaller than the radius of cylinder 2.
- the advantage of the latter setting is that the plate "grips" the cylinder and will stay attached even if the vacuum is released while cylinder 2 is rotating.
- plate 1 is inserted between rollers 5 and 6.
- Motorized roller 6 pulls the plate in, and it wraps itself around cylinder 2 which is rotated slowly to assist the loading.
- vacuum pump 3 is activated to secure the plate.
- drum 2 and roller 6 are rotated in the opposite direction.
- diverter 9 is moved to touch drum 2, causing the plate to climb on diverter 9 and feed into pinch rollers 5 and 6.
- the vacuum is maintained on drum 2 during unloading to provide sufficient friction between drum 2 and plate 1 in order to push it over diverter 9 and into pinch rollers 5 and 6.
- Diverter 9 can be a solid sheet, extending the full length of drum 2, or a few "fingers" along drum 2.
- drum and diverter are similar to prior art used in drum imagesetters such as those made by Barco (Belgium) and Dainippon Screen (Japan) and are well known in the art.
- plate 1 When plate 1 reaches roller 4 it will be bent in a direction opposite to the curl it acquired from roller 7. By placing roller 4 at the correct position the curl is cancelled out and the plate emerges flat, with the exception of a minor bend near the edge.
- roller 4 By the way of example, if cylinder 2 is of a diameter of 250 mm the recommended diameters of rollers 4, 5, 6 and 7 is about 50 mm each.
- the arrangement shown will load aluminum printing plates from 0.1 mm to 0.3 mm in thickness onto the drum.
- the required vacuum can be as low as 150 mm Hg, however a higher vacuum of about 500 mm Hg is desired. While the preferred embodiment uses the curl of the plate to fit on the outside of a cylinder it is obvious that the same method can be used to fit the plate inside a partial cylindrical shape as illustrated in FIG. 2. This feature is useful in Computer-to-Plate systems of the internal drum type.
Abstract
Description
Claims (22)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/664,480 US5699740A (en) | 1996-06-17 | 1996-06-17 | Method of loading metal printing plates on a vacuum drum |
DE19731050A DE19731050C2 (en) | 1996-06-17 | 1997-07-21 | Method and device for mounting a printing plate on a drum or cylinder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/664,480 US5699740A (en) | 1996-06-17 | 1996-06-17 | Method of loading metal printing plates on a vacuum drum |
DE19731050A DE19731050C2 (en) | 1996-06-17 | 1997-07-21 | Method and device for mounting a printing plate on a drum or cylinder |
Publications (1)
Publication Number | Publication Date |
---|---|
US5699740A true US5699740A (en) | 1997-12-23 |
Family
ID=26038425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/664,480 Expired - Fee Related US5699740A (en) | 1996-06-17 | 1996-06-17 | Method of loading metal printing plates on a vacuum drum |
Country Status (2)
Country | Link |
---|---|
US (1) | US5699740A (en) |
DE (1) | DE19731050C2 (en) |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5947028A (en) * | 1998-05-07 | 1999-09-07 | Creo Products Inc. | Method and apparatus for holding a printing plate on a vacuum drum |
US6050189A (en) * | 1997-02-17 | 2000-04-18 | Heidelberger Druckmaschinen Ag | Method for multicolor printing of nonabsorbent material, and a printing press for printing in accordance with the method |
US6397751B1 (en) * | 2000-11-16 | 2002-06-04 | Heidelberger Druckmaschinen Ag | Method of extracting a printing plate from a plate cylinder of a printing unit |
US6539865B2 (en) | 2001-02-21 | 2003-04-01 | Kodak Polychrome Graphics Llc | Method of preparing a lithographic printing plate for imaging in a printer engine |
US20040046863A1 (en) * | 2002-06-26 | 2004-03-11 | Creo Inc. | Method and apparatus for clamping a printing media |
US6707591B2 (en) | 2001-04-10 | 2004-03-16 | Silicon Light Machines | Angled illumination for a single order light modulator based projection system |
US6712480B1 (en) | 2002-09-27 | 2004-03-30 | Silicon Light Machines | Controlled curvature of stressed micro-structures |
US6714337B1 (en) | 2002-06-28 | 2004-03-30 | Silicon Light Machines | Method and device for modulating a light beam and having an improved gamma response |
US6716017B2 (en) | 2001-03-09 | 2004-04-06 | Paper Converting Machine Company | Embossing roll with removable plates |
US6728023B1 (en) | 2002-05-28 | 2004-04-27 | Silicon Light Machines | Optical device arrays with optimized image resolution |
US6726433B1 (en) | 1996-08-07 | 2004-04-27 | Agfa Corporation | Apparatus for loading and unloading a supply of plates in an automated plate handler |
US6732653B2 (en) | 2002-04-26 | 2004-05-11 | Kodak Polychrome Graphics Llc | Method to remove unwanted, unexposed, positive-working, radiation-sensitive layer |
US20040103806A1 (en) * | 2002-04-26 | 2004-06-03 | Ray Kevin B. | Method to remove unwanted, unexposed, radiation-sensitive layer in a lithographic printing plate |
US6747781B2 (en) | 2001-06-25 | 2004-06-08 | Silicon Light Machines, Inc. | Method, apparatus, and diffuser for reducing laser speckle |
US6764875B2 (en) | 1998-07-29 | 2004-07-20 | Silicon Light Machines | Method of and apparatus for sealing an hermetic lid to a semiconductor die |
US6767751B2 (en) | 2002-05-28 | 2004-07-27 | Silicon Light Machines, Inc. | Integrated driver process flow |
US6782205B2 (en) | 2001-06-25 | 2004-08-24 | Silicon Light Machines | Method and apparatus for dynamic equalization in wavelength division multiplexing |
US6801354B1 (en) | 2002-08-20 | 2004-10-05 | Silicon Light Machines, Inc. | 2-D diffraction grating for substantially eliminating polarization dependent losses |
US6800238B1 (en) | 2002-01-15 | 2004-10-05 | Silicon Light Machines, Inc. | Method for domain patterning in low coercive field ferroelectrics |
US6806997B1 (en) | 2003-02-28 | 2004-10-19 | Silicon Light Machines, Inc. | Patterned diffractive light modulator ribbon for PDL reduction |
US6813059B2 (en) | 2002-06-28 | 2004-11-02 | Silicon Light Machines, Inc. | Reduced formation of asperities in contact micro-structures |
US6822797B1 (en) | 2002-05-31 | 2004-11-23 | Silicon Light Machines, Inc. | Light modulator structure for producing high-contrast operation using zero-order light |
US6829092B2 (en) | 2001-08-15 | 2004-12-07 | Silicon Light Machines, Inc. | Blazed grating light valve |
US6829258B1 (en) | 2002-06-26 | 2004-12-07 | Silicon Light Machines, Inc. | Rapidly tunable external cavity laser |
US6829077B1 (en) | 2003-02-28 | 2004-12-07 | Silicon Light Machines, Inc. | Diffractive light modulator with dynamically rotatable diffraction plane |
US7225737B2 (en) | 2003-12-09 | 2007-06-05 | Kodak Graphic Communications Canada Company | Method for automated platemaking |
US20130108323A1 (en) * | 2011-10-30 | 2013-05-02 | Hewlett-Packard Development Company Lp | Photoconductive foil sheet applicator |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10112761A1 (en) | 2000-04-13 | 2001-10-18 | Heidelberger Druckmasch Ag | Method for using a printing plate for illustrating and flexographic printing involves securing printing plate by magnetic cylinder in illustrating machine and then undertaking printing using illustrated plate |
DE10307089B4 (en) * | 2002-10-19 | 2006-05-24 | Koenig & Bauer Ag | Squeegee of a printing press |
DE102007018936A1 (en) * | 2007-04-21 | 2008-10-23 | Manroland Ag | Printing plate exchange device e.g. for processing machine, comprises feed device acting on rear face of print-lacquering plate |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US2503597A (en) * | 1946-04-10 | 1950-04-11 | Aetna Standard Eng Co | Bending and straightening machine |
US3304757A (en) * | 1964-04-06 | 1967-02-21 | Kaufmann Tool And Engineering | Machine for rolling arcuate sheet metal shapes |
US3371513A (en) * | 1965-12-09 | 1968-03-05 | Kaufmann Tool & Engineering Co | Open end rolling machine |
US3937052A (en) * | 1975-01-29 | 1976-02-10 | Mosstype Corporation | Machine for rolling and curving printing plates |
JPH05200970A (en) * | 1992-01-29 | 1993-08-10 | Mitsubishi Heavy Ind Ltd | Manufacturing of plate cylinder for printing machine |
DE4239253A1 (en) * | 1992-06-19 | 1994-05-26 | Kba Planeta Ag | Flexible printing plate clamped to forme cylinder - is removed using auxiliary clamping system and small rollers to bend plate backwards |
US5402721A (en) * | 1993-05-13 | 1995-04-04 | Comco Machinery, Inc. | Vacuum printing plate roller |
US5488906A (en) * | 1993-07-05 | 1996-02-06 | Scitex Corporation Ltd. | Internal drum printing plate plotter |
US5557960A (en) * | 1993-04-03 | 1996-09-24 | Man Roland Druckmaschinen Ag | Device for producing a tube, in particular a tube-shaped printing form, with a continuous circumferential surface |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3426563A1 (en) * | 1983-10-05 | 1985-04-25 | Didde Graphic Systems Corp., Emporia, Kan. | Plate-bending apparatus |
DE3341924A1 (en) * | 1983-11-19 | 1985-05-30 | Heidelberger Druckmasch Ag | BENDING DEVICE FOR OFFSET PRINTING PLATES |
-
1996
- 1996-06-17 US US08/664,480 patent/US5699740A/en not_active Expired - Fee Related
-
1997
- 1997-07-21 DE DE19731050A patent/DE19731050C2/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2503597A (en) * | 1946-04-10 | 1950-04-11 | Aetna Standard Eng Co | Bending and straightening machine |
US3304757A (en) * | 1964-04-06 | 1967-02-21 | Kaufmann Tool And Engineering | Machine for rolling arcuate sheet metal shapes |
US3371513A (en) * | 1965-12-09 | 1968-03-05 | Kaufmann Tool & Engineering Co | Open end rolling machine |
US3937052A (en) * | 1975-01-29 | 1976-02-10 | Mosstype Corporation | Machine for rolling and curving printing plates |
JPH05200970A (en) * | 1992-01-29 | 1993-08-10 | Mitsubishi Heavy Ind Ltd | Manufacturing of plate cylinder for printing machine |
DE4239253A1 (en) * | 1992-06-19 | 1994-05-26 | Kba Planeta Ag | Flexible printing plate clamped to forme cylinder - is removed using auxiliary clamping system and small rollers to bend plate backwards |
US5557960A (en) * | 1993-04-03 | 1996-09-24 | Man Roland Druckmaschinen Ag | Device for producing a tube, in particular a tube-shaped printing form, with a continuous circumferential surface |
US5402721A (en) * | 1993-05-13 | 1995-04-04 | Comco Machinery, Inc. | Vacuum printing plate roller |
US5488906A (en) * | 1993-07-05 | 1996-02-06 | Scitex Corporation Ltd. | Internal drum printing plate plotter |
Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6726433B1 (en) | 1996-08-07 | 2004-04-27 | Agfa Corporation | Apparatus for loading and unloading a supply of plates in an automated plate handler |
US6050189A (en) * | 1997-02-17 | 2000-04-18 | Heidelberger Druckmaschinen Ag | Method for multicolor printing of nonabsorbent material, and a printing press for printing in accordance with the method |
US5947028A (en) * | 1998-05-07 | 1999-09-07 | Creo Products Inc. | Method and apparatus for holding a printing plate on a vacuum drum |
US6764875B2 (en) | 1998-07-29 | 2004-07-20 | Silicon Light Machines | Method of and apparatus for sealing an hermetic lid to a semiconductor die |
US6397751B1 (en) * | 2000-11-16 | 2002-06-04 | Heidelberger Druckmaschinen Ag | Method of extracting a printing plate from a plate cylinder of a printing unit |
US6539865B2 (en) | 2001-02-21 | 2003-04-01 | Kodak Polychrome Graphics Llc | Method of preparing a lithographic printing plate for imaging in a printer engine |
US6716017B2 (en) | 2001-03-09 | 2004-04-06 | Paper Converting Machine Company | Embossing roll with removable plates |
US6707591B2 (en) | 2001-04-10 | 2004-03-16 | Silicon Light Machines | Angled illumination for a single order light modulator based projection system |
US6747781B2 (en) | 2001-06-25 | 2004-06-08 | Silicon Light Machines, Inc. | Method, apparatus, and diffuser for reducing laser speckle |
US6782205B2 (en) | 2001-06-25 | 2004-08-24 | Silicon Light Machines | Method and apparatus for dynamic equalization in wavelength division multiplexing |
US6829092B2 (en) | 2001-08-15 | 2004-12-07 | Silicon Light Machines, Inc. | Blazed grating light valve |
US6800238B1 (en) | 2002-01-15 | 2004-10-05 | Silicon Light Machines, Inc. | Method for domain patterning in low coercive field ferroelectrics |
US6843176B2 (en) | 2002-04-26 | 2005-01-18 | Kodak Polychrome Graphics, Llc | Method to remove unwanted, unexposed, radiation-sensitive layer in a lithographic printing plate |
US20040103806A1 (en) * | 2002-04-26 | 2004-06-03 | Ray Kevin B. | Method to remove unwanted, unexposed, radiation-sensitive layer in a lithographic printing plate |
US6732653B2 (en) | 2002-04-26 | 2004-05-11 | Kodak Polychrome Graphics Llc | Method to remove unwanted, unexposed, positive-working, radiation-sensitive layer |
US6767751B2 (en) | 2002-05-28 | 2004-07-27 | Silicon Light Machines, Inc. | Integrated driver process flow |
US6728023B1 (en) | 2002-05-28 | 2004-04-27 | Silicon Light Machines | Optical device arrays with optimized image resolution |
US6822797B1 (en) | 2002-05-31 | 2004-11-23 | Silicon Light Machines, Inc. | Light modulator structure for producing high-contrast operation using zero-order light |
US6837160B2 (en) | 2002-06-26 | 2005-01-04 | Creo, Inc. | Method and apparatus for clamping a printing media |
US20040046863A1 (en) * | 2002-06-26 | 2004-03-11 | Creo Inc. | Method and apparatus for clamping a printing media |
US6829258B1 (en) | 2002-06-26 | 2004-12-07 | Silicon Light Machines, Inc. | Rapidly tunable external cavity laser |
US6813059B2 (en) | 2002-06-28 | 2004-11-02 | Silicon Light Machines, Inc. | Reduced formation of asperities in contact micro-structures |
US6714337B1 (en) | 2002-06-28 | 2004-03-30 | Silicon Light Machines | Method and device for modulating a light beam and having an improved gamma response |
US6801354B1 (en) | 2002-08-20 | 2004-10-05 | Silicon Light Machines, Inc. | 2-D diffraction grating for substantially eliminating polarization dependent losses |
US6712480B1 (en) | 2002-09-27 | 2004-03-30 | Silicon Light Machines | Controlled curvature of stressed micro-structures |
US6829077B1 (en) | 2003-02-28 | 2004-12-07 | Silicon Light Machines, Inc. | Diffractive light modulator with dynamically rotatable diffraction plane |
US6806997B1 (en) | 2003-02-28 | 2004-10-19 | Silicon Light Machines, Inc. | Patterned diffractive light modulator ribbon for PDL reduction |
US7225737B2 (en) | 2003-12-09 | 2007-06-05 | Kodak Graphic Communications Canada Company | Method for automated platemaking |
US20070186795A1 (en) * | 2003-12-09 | 2007-08-16 | Daniel Gelbart | Method for automated platemaking |
US20130108323A1 (en) * | 2011-10-30 | 2013-05-02 | Hewlett-Packard Development Company Lp | Photoconductive foil sheet applicator |
US8787797B2 (en) * | 2011-10-30 | 2014-07-22 | Hewlett-Packard Development Company, L.P. | Photoconductive foil sheet applicator |
Also Published As
Publication number | Publication date |
---|---|
DE19731050C2 (en) | 1999-09-02 |
DE19731050A1 (en) | 1999-01-28 |
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